This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A302743 #4 Apr 12 2018 11:23:21 %S A302743 8,128,1652,21625,285613,3778433,50012515,662080634,8765152857, %T A302743 116041489300,1536272725817,20338725884827,269264599669170, %U A302743 3564797029819794,47194388320663969,624807045634867762 %N A302743 Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302743 Row 4 of A302741. %H A302743 R. H. Hardin, <a href="/A302743/b302743.txt">Table of n, a(n) for n = 1..210</a> %F A302743 Empirical: a(n) = 13*a(n-1) +16*a(n-2) -165*a(n-3) -70*a(n-4) +100*a(n-5) -564*a(n-6) +879*a(n-7) -500*a(n-8) +1128*a(n-9) +1340*a(n-10) -448*a(n-11) -182*a(n-12) -314*a(n-13) +12*a(n-14) +2*a(n-15) for n>16 %e A302743 Some solutions for n=5 %e A302743 ..0..0..1..0..1. .0..0..1..1..1. .0..1..1..0..1. .0..1..1..0..1 %e A302743 ..0..1..1..0..1. .0..1..0..0..0. .0..1..0..0..0. .0..0..0..1..1 %e A302743 ..0..0..0..1..0. .1..1..1..0..1. .0..0..1..1..1. .0..1..1..1..0 %e A302743 ..0..1..1..1..1. .0..1..1..1..1. .1..0..0..0..0. .1..1..0..0..1 %Y A302743 Cf. A302741. %K A302743 nonn %O A302743 1,1 %A A302743 _R. H. Hardin_, Apr 12 2018